It wasn't an APNG flight at all, but the AC was hired from them.
It was apparently due to a sudden strong wind change.
According to one senior politician, we should expect that sort of thing to happen far more regularly, as the reason why all aircraft in PNG crash is because of climate change and global warming. we should all expect to see many more of the same sorts of accidents, and except it as one of the risks of flying in PNG.
CAA doesn't investigate crashes. that's the ATSB's job.
Seems that the Pollies are about as well informed as the press.